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I would say that it is easier than you are thinking.

Some people disconnect ignition and remove sparkplug.
Insert the compression gauge into spark plug hole and turn engine over.
Read gauge and record numbers for cylinder and compression. Repeat for all the cylinders.

Doing one will only let you know what the compression is on the one cylinder. It will not let you know if everything in the others is up to par. So you have to do them all. Generally you want them to be similar to each other. I can't remeber what the compression should be or what the acceptable range is.

I am sure that someone will chime in and say something different or that they do it another way. This is the way the I was taught by someone and never really checked on the way that everyone is supposed to do it. My numbers have always been the same thought, so I figured that it was right.
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